Brake-shoe.



wl DUSCHNHZ.'

BRAKE SHOL APPLICATION FILED HOWZQ, |913 mem@ June 15, 1915.v

BMKIEPSHUE.

mmm-maus specification of Letters Patent.

Patented Jane i5, i915.

Application filed November S39, i913. Serial En. 303,730.

To all whom 'it may concern:

Be it known that LWILLIBALD DUsoHNrrz, a subject of the Emperor ofAustria-Hungary, residing at Vienna, in. ilustria-Hunn gary, haveinvented certain new and useful improvements in Brake-Shoes, of whichthe following is a specilication.

The object. of this invention is to provide` an eilpicientand silentbrake-shoe which iniposes less wear, on the wheel to which it isapplied, than the brake-shoes heretofore known. To this end I face theshoe with felt, preferably arranged so that the ends of the iibers formthe brake surface. The felt may be prepared by subjecting it to veryhigh pressure, and may be impregnated with fatty substances, wax andlike substances having a preservative effect.

The invention is illustrated in the accompanying drawing, which showsseveral embodiments thereof. l

Figurel is a side-view of a brake-shoe, partly in section; Fig. 2 is afront view orf the same shoe, and Fig. 3 a cross section thereof. Figylis afside view of -a shoe with detachable ribs for holding thefelt. Fig.5 is a cross-section of another form of shoe, and Figs. 6 and 7 arefront views, partly broken away, showing two other constructions. Fig. 8is a perspective elevation of another construction.

Referring in the irst instance to the construction shown in Figs. l to3, the metal body or holder l is of a well lmfmvn shape, with lateralribs 42 and a central rib fl, strips of felt 3 being inserted betweenthe ribs to afford the brake surface. The ribs are made in one piecewith the body l. But it is also possible to make the casing whichsurrounds the felt removable from the body 1 and ex changeable.

Fig. 4: shows a modification wherein ribs 2 are joined to a body l" bydove-tail joints, the ribs in this case also serving to support feltbetween them.

Fig. 5 shows a modification in which a single block of felt 3b is heldbetween two ribs 2l formed at opposite sides of the shoe.

Fig. 6 shows a construction in which pieces of felt 3 are placed incells formed by transverse ribs 4l joining two lateral ribs 2 of thebrake-shoe.

In the construction shown in Fig. i', cells forl the felt are formedbetweenlateral ribs block of :felt

2d and oblique ribs ed, the latter being somewhat curved, so that theshort strips of felt have a twist. The ribs Ilv are provided with ridgeste for the purpose of engaging the felt, and the ridges 4ta on one sideof each cell are set so as to lie'between the ridges on the .other side,so that there is no undue compression o the felt. The othermodificatiensare also provided with ridges whichmay be running in anysuitable direction.

ln the construction shown in Fig. 8 a 35 is embraced by a frame 5,v'liich is closed tightly after insertion or' the Felt is adapted tooperate very eiliciently as a brake surface on wheel treads of 'iron andsteel, especially if the ends of the fiber form the brake surface. Thedurability of the felt may be increased by compression thereof after theusual process of lulliug, a high pressure, say of 200 lig. per cin.2being used. After being thus compressed the felt should be inserted intethe cells, grooves or frame of the 4bra'keshoe owhich it is `to formpart, before ithas been able `to eX- pand again. The subsequentexpansion then gives the felt a very rm hold in the shoes,

and also causes it to bulge out slightly at the f' face of the brake.Fatty substances, wax or the like used for vimpregnation of the feltincreases the dura` bility thereof and serves to prolongate its life.The impregnation may take place before or after compression of the felt.

What l claim as my invention and desire to secure by Letters Fatent pfthe United States is Abrake-shoe or the character described, comprisingin combination, a holder having side flanges, ribs connecting saidflanges for `forming cells with the same, a facing of gli,"

highly compressed :felt in each of said .cells vconstituting the brakeface of the shoe, and

a plurality of ridges alternately arranged at the lateral faces of saidribs for holding the felt in said cells.

l In witness whereof l have signed this specification in the presence oftwo witnesses.

WILLIBALD nnsoiinrrzjf Witnesses: y

RICHARD Kor/UNIE, ADA Manin BERGER'.

